Vibram KSO EVO aerobic & fitness shoes build the perfect combination of ground feedback and protection. Unmatched grip and flexibility allow you to fully experience diverse terrain. These highly responsive shoes encourage good form while remaining durable enough to absorb shock. This footwear is Vegan-friendly.Upper: Polyester fabric provides breathable flexibility. Closed, quick lace system assures a custom fit for a wide range of foot types. Midsole: EVA + Antimicrobial Drilex Sockliner.Outsole: XS TREK compound provides optimal balance of traction and durability with response and stability.